sedimentary
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or earthy yellow; Luster: Dull/Earthy; Crystal structure: Granular/Fine-grained; Cleavage: None, often breaks along bedding planes.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, or earthy yellow
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or earthy yellow; Luster: Dull/Earthy; Crystal structure: Granular/Fine-grained; Cleavage: None, often breaks along bedding planes.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) in environments like riverbeds, deltas, or desert basins over millions of years.
Uses & applications
Commonly used in construction for paving, building facades, and as an aggregate in landscaping and industrial sand applications.
Geological facts
Sandstone records historical environmental changes; the iron oxides within it often give it its characteristic red, orange, or yellow hues.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layers or bedding. Commonly found in canyons, quarries, and coastal outcrops.
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Sandstone
Arenite (primarily SiO2)
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